System Design: How Tinder Works at Scale | Matching, Swipes, Geospatial Indexing Explained

This video presents a full system design walkthrough on how to build a large-scale dating application similar to Tinder, based on a transcript led by a former Staff Engineer. The discussion follows a clear and structured framework beginning with defining the critical functional requirements—such as swiping, matching, and profile browsing—and the non-functional needs like extremely low latency and high reliability.
The design then moves into identifying the core data entities and the essential user-facing APIs before outlining a high-level microservices architecture suitable for a global-scale dating platform. The majority of the video is dedicated to technical deep dives on the hardest system challenges, including maintaining transactional consistency for synchronous match creation during high-volume swipe traffic. Additional analysis explores how to optimize profile stack loading using geospatial indexing and how to resolve the key constraint of ensuring users do not repeatedly see the same profiles.
This video is ideal for candidates preparing for demanding system design interviews or for engineers who want to understand the architectural complexity behind modern dating platforms.

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